She wanted to make a clean break with the past.

她想与过去完全断绝。

《牛津词典》

You must make a clean break with him.

你必须和他划清界限。

《新英汉大辞典》

I hope that these facts I have stated in this letter may determine you to make a clean break with your past and start afresh.

我希望这封信中举述的事实能使你翻然悔悟，弃旧图新。

《新英汉大辞典》

When I spoke to Harris for my original post, he told me he planned to make a clean break with the past.

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Fidesz argues the changes are necessary to make a clean break with the previous constitution, which was adopted in 1989 when Hungary threw off communist rule.

BBC: Hungary defies critics over change to constitution

Johnson had a choice to stay with what was already there or make a clean break and go with something totally new in the way Geoff Cooke did with a young Will Carling.

BBC: Jeremy Guscott column